If you want to build up a collection of great ebooks on your Kindle without spending a dime, Red Ferret has a simple but neat trick to use Amazon's individual RSS feeds and our favorite web automator, IFTTT.

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It's basically all about finding the right RSS subscription link based on the genre you like and then creating an IFTTT recipe to send alerts to your inbox when a new book is added to it. The alert can help you get some great deals too.

At the bottom of the page, you will no longer see the "Top Free" RSS as Red Ferret mentions, but you there is still a "Best Sellers" RSS available for subscription. Once you have the link, set up an IFTTT recipe for it as instructed in the video above and you'll be notified of changes in the best sellers list. Yup, IFTTT is fantastic to ensure you never miss a deal.

Update: Amazon recently removed the option to subscribe to the Top Free RSS feed, leaving only an option for a Best Seller RSS feed, rendering the original trick obsolete. We test these things for accuracy before we post them, but we didn't realize we were using the wrong RSS. We're sorry for the misinformation. The article has been updated to reflect the changes.